Stowaway

Anthony knight just turned 16. He has been living alone on the streets of Bristol, England for the past six years after his parents were brutally murdered by pirates. Anthony now despises pirates, any chance he gets he will kill them all one by one. Soon after his parents deaths he met a girl named Alice, eversince they've been close and almost... know everything about eachother. Alice has a secret. When she mysteriously disappears Anthony thinks she has been kidnapped. He leaves bristol getting on a shipping boat in search of her.
What will happen to Anthony? Will he find Alice? What's the secret?